Mitsubishi Electric MELSEC iQ-R Series User Manual page 708

No. Name
SD1760 Extension cable
connection status
SD1761 Extension cable route
*1
information
*1 There are restrictions on the firmware version of the CPU module and software version of the engineering tool. ( Page 747 Added
and Enhanced Functions)
*2 Page 731 Waiting time for cyclic data receive after system switching (Twcyc)
APPX
706
Appendix 5 List of Special Register Areas
Data stored
Extension cable
*1
connection status (bit
pattern)
Off: Not connected/
extension cable
error/connected
improperly
On: Connected properly
Extension cable route
information (bit pattern)
Off: Inactive
On: Active
Details
• In a redundant configuration of extension cables, the connection
status between each redundant extension base unit (OUT1/
OUT2) in the 1st to 6th extension levels and each next lower
level are stored using the following bit pattern.
b15 b8 b7
b1 to b6: 1st to 6th extension base units (OUT1)
b9 to b14: 1st to 6th extension base units (OUT2)
b0, b7, b8, b15: Not used
• In a redundant configuration of extension cables, the status is
stored in the CPU module of the control system.
• If an extension base unit cannot communicate with the CPU
module due to an extension cable failure, the bits corresponding
to the extension base unit and ones in the lower levels will turn
off.
• When the systems are switched, the CPU module of the new
control system turns off all bits.
• In the 2nd and later extension levels, if redundant extension base
units and other extension base units are used together, the bits
corresponding to extension base units in the lower levels than
the redundant extension base unit will turn off.
• In a redundant configuration of extension cables, the route status
(active/inactive) between each redundant extension base unit
(OUT1/OUT2) in the 1st to 6th extension levels and each next
lower level are stored using the following bit pattern.
b15 b8 b7
b1 to b6: 1st to 6th extension base units (OUT1)
b9 to b14: 1st to 6th extension base units (OUT2)
b0, b7, b8, b15: Not used
• In a redundant configuration of extension cables, the status is
stored in the CPU module of the control system.
• When a bit of SD1760 is off, the corresponding bit of SD1761 is
also off.
• When the systems are switched, the CPU module of the new
control system turns off all bits.
b0
b0
Set by (setting
timing)
S (Initial/every
END/system
switching)
S (Initial/every
END/system
switching)